Battery Usage Questions

I don't understand the details of battery usage. I have The Moron Test, and after playing it, awhile later, it was showing as using 40% of the battery. After a shut down and power up, it was showing as using 10%, without my having played it. I haven't played it since yesterday. A short while ago, I did a Safe Mode reboot, and it showed as using 9% - hadn't been started. Shut down, powered on, it is still showing as using 9% of the battery.

Now after the Safe Mode reboot, and boot back into normal mode, Bluetooth is showing that it is using 7% - yet it is off, and hasn't been turned on since well before the Safe Mode reboot.

I understand Cell Standby, Display and Phone idle - but why are these other things using my battery when they are not in use and haven't been in use? Task Manager shows that Moron Test is not running, nor does it show any bluetooth running.